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fx t-12 400 .25 need to calm it down

I think it's the nature of the beast. 25 uses more air and is therefore going to be louder than 22. Also, 25 are typically tuned for max power thus making them louder. It looks like the FX T-12 400 comes with a basic LDC which will only do so much, I think it's one of their value models. It's probably a lot quieter than if there was no LDC. My experience has been that FXs bark a bit on high power, but less so on the low or medium power settings.